CN108809173B - Common-bus open-winding brushless doubly-fed wind generator system fault-tolerant control method - Google Patents
Common-bus open-winding brushless doubly-fed wind generator system fault-tolerant control method Download PDFInfo
- Publication number
- CN108809173B CN108809173B CN201810503073.0A CN201810503073A CN108809173B CN 108809173 B CN108809173 B CN 108809173B CN 201810503073 A CN201810503073 A CN 201810503073A CN 108809173 B CN108809173 B CN 108809173B
- Authority
- CN
- China
- Prior art keywords
- power
- fault
- winding
- voltage vector
- side converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
- H02P21/28—Stator flux based control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The common bus open winding brushless double-fed wind driven generator system fault-tolerant control method comprises an open winding brushless double-fed generator (1), wherein the open winding brushless double-fed generator (1) is provided with two sets of three-phase symmetrical stator windings with different pole numbers, aiming at open circuit and short circuit faults of a machine side converter power switch device in the open winding brushless double-fed wind driven generator system, in order to facilitate fault diagnosis and subsequent fault-tolerant control, the common bus-common double-level converter topological structure is improved, and fault-tolerant control methods adopted after different faults occur are provided based on a direct power control method.
Description
The technical field is as follows:
the invention belongs to the field of wind power generation, and particularly relates to an open-winding brushless doubly-fed wind generator system and a fault-tolerant control method.
Background art:
the brushless doubly-fed generator has the advantages of being brushless in structure, low in maintenance cost, small in required converter capacity, high in reliability and the like, and the brushless doubly-fed generator is widely concerned in the field of wind power generation. In the field of large-scale wind power generation, such as offshore wind power generation systems, the environment is severe, so that the high reliability of the system becomes the premise of sustainable operation. The wind generating set generally comprises a motor, a controller, a converter and a series of sensors, wherein any link fails to work, and the system is affected: the performance of the wind power generation system is influenced if the wind power generation system is small, and all the wind power generation systems are paralyzed if the wind power generation system is heavy. Therefore, the reliability of any link should be paid sufficient attention.
The power switch device in the converter is frequently switched on or off under the influence of a system control strategy, and is greatly influenced by the working environment of the power switch device and the energy flow of the system, so that the converter, particularly a machine side inversion part, is often a weak link which is easy to break down in the system. Many circuits with detection and protection functions, including overvoltage and overcurrent protection circuits, driving protection circuits, buffer circuits and the like, are integrated in modern intelligent power modules, so that safe and stable operation of the converter is guaranteed to a certain extent. However, the offshore wind power generation environment is complex, and a plurality of disturbances can cause the failure of the protection circuit of the power switch device. Therefore, it is important to adopt a proper fault-tolerant control strategy to enable the system to continuously and stably operate after the power switching device fails and still meet the required indexes.
In addition, direct power control is a novel brushless doubly-fed generator control method, the active power and the reactive power of a brushless doubly-fed motor can be directly subjected to feedback control, the method emphasizes the acceleration of the dynamic response speed of the active power and the reactive power, and the method is more suitable for being applied to the field of wind power generation. The open winding structure is applied to the brushless doubly-fed generator, so that the converter capacity of the system can be effectively reduced, and the fault-tolerant capability of the system is improved.
Disclosure of Invention
The purpose of the invention is as follows:
the invention provides an open winding brushless double-fed wind driven generator system and a fault-tolerant control method, and aims to solve the problem that the open winding brushless double-fed wind driven generator system cannot continuously and stably operate after a power switch device of an on-machine side converter fails, and further improve the reliability of the system.
The technical scheme is as follows:
open winding brushless doubly-fed wind generator system which characterized in that: the system comprises an open-winding brushless doubly-fed generator (1), wherein the open-winding brushless doubly-fed generator (1) is provided with two sets of three-phase symmetrical stator windings with different pole numbers, namely a power winding (2) and a control winding (3), and the power winding is woundThe group (2) is connected with a power grid (5), and the number of pole pairs of the power winding (2) is p p The control winding (3) is of an open winding structure, namely 6 terminals of the control winding (3) are respectively led out from two ends, the two ends are respectively connected with the first machine side converter (6) and the second machine side converter (7), and the number of pole pairs of the control winding (3) is p c The coupling relation between the power winding (2) and the control winding (3) is realized by the rotor (4), and the number of pole pairs of the rotor (4) is p r ＝p p +p c 。
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system is characterized by comprising the following steps of: the method is characterized in that a common bus-shared double-level converter topological structure is added with a plurality of relays (8) capable of being conducted in two directions and a plurality of fast fuses (9), and active power and reactive power of a power winding are independently controlled by selecting proper space voltage vectors based on a direct power control method, so that a system can run in a fault-tolerant mode after a power switch device fails; the method comprises the steps of re-establishing a switching voltage vector selection table according to error signals of active power and reactive power of a power winding (2), information of a sector where a flux linkage of a control winding (3) is located and fault information of a fault diagnosis module (15), opening a corresponding bidirectional breakover relay (8) according to the fault information of the fault diagnosis module (15) to reconstruct a converter topological structure, and independently controlling the active power and the reactive power of the power winding (2) of the open-winding brushless doubly-fed generator by selecting a proper space voltage vector to further realize fault-tolerant operation of the system after a power switching device is in fault;
collecting a voltage signal (u) of a power winding (2) p ) And current signal (i) p ) And a voltage signal (u) for controlling the winding (3) c ) And current signal (i) c ) Obtaining a voltage signal (u) of the power winding (2) under a two-phase static coordinate system through a coordinate transformation module (10) pαβ ) And a current signal (i) pαβ ) And a control winding (3) voltage signal (u) cαβ ) And current signal (i) cαβ ) Voltage signal (u) of the power winding (2) pαβ ) And current signal (i) pαβ ) The instantaneous active power (P) output by the power winding (2) is obtained through the instantaneous power calculation module (11) p ) And reactive power(Q p ) Controlling the voltage signal (u) of the winding (3) cαβ ) And a current signal (i) cαβ ) Obtaining a flux linkage angle (theta) through a control winding flux linkage sector judging module (12), and obtaining an active power given value (P) of a power winding (2) ref ) Actual value (P) of active power associated with the power winding (2) p ) The error value (delta P) between the actual active power value and the given value of the power winding (2) is obtained by comparing the actual active power value with the given value through an active power hysteresis comparator (13) p ) Given value of reactive power (Q) of the power winding (2) ref ) Actual value (Q) of reactive power with the power winding (2) p ) The error value (delta Q) between the actual reactive power value and the given value of the power winding (2) is obtained by comparing the actual reactive power value with a reactive power hysteresis comparator (14) p ) After the power switch device has a fault, a bidirectional conductive relay (8) connected with a fault phase bridge arm is switched on by utilizing fault information of a fault diagnosis module (15) to reconstruct a topological structure of the converter, and then the fault information of the fault diagnosis module (15), an actual value of active power and an error value (delta P) of a given value are used for reconstructing a topological structure of the converter p ) Error value (delta Q) between actual value of reactive power and given value p ) And combining the magnetic chain angle (theta), making a corresponding switching voltage vector selection table, and obtaining a control signal (u) of the machine side converter (6) through a switching voltage vector selection module (16) abc1 ) Control signal (u) of the machine side converter (7) abc2 ) And further driving the open-winding brushless doubly-fed generator (1) to realize fault-tolerant control.
When an a 1-phase bridge arm of the machine-side converter (6) breaks down, the fault diagnosis module (15) controls a first solid state relay (SSR 1) in the first machine-side converter (6) to be switched on, and at the moment, the topological structure of the common-bus double-level converter is changed. The system can operate in fault tolerance under a direct power control method by utilizing a synthesized space voltage vector generated by the changed topological structure of the common bus double-level and double-level converter.
After the first solid state relay (SSR 1) is switched on, the first machine-side converter (6) and the second machine-side converter (7) share 32 different switching states, and 14 space voltage vectors distributed at different positions are generated, wherein no zero vector exists. U shape a-b Representing the voltage vector U generated by the first machine-side converter (6) a Side-to-side converterVoltage vector U generated by current device (7) b The resultant space voltage vector; the selection principle of the voltage vector for fault-tolerant operation is based on a direct power control method, namely when the positions of control winding magnetic chains are different, the active power or the reactive power of the power winding is independently controlled by selecting a proper control winding voltage vector. There are two different voltage vector selection schemes, which divide the whole plane into 10 sectors and 8 sectors according to the selected voltage vector, so as to achieve the purpose of accurate control, and the corresponding switch voltage vector selection tables are respectively as follows:
TABLE 1 (a) switching Voltage vector selection Table after a 1-phase Fault
TABLE 1 (b) switching Voltage vector selection Table after a 1-phase Fault
When an a 1-phase bridge arm of the machine side converter (6) and an a 2-phase bridge arm of the machine side converter (7) both have faults, the fault diagnosis module (15) controls a first solid state relay (SSR 1) in the first machine side converter (6) and a fourth solid state relay (SSR 4) in the second machine side converter (7) to be switched on, and at the moment, the topological structure of the common-bus double-level converter is changed; the system can operate in a fault-tolerant mode under a direct power control method by utilizing a synthesized space voltage vector generated by the changed topological structure of the common bus double-level converter, and a corresponding switch voltage vector selection table is shown in a table 2;
table 2 switching voltage vector selection table after both a 1-phase bridge arm and a 2-phase bridge arm have failed
When the a1 phase of the machine side converter (6) and the b2 phase of the machine side converter (7) both have faults, the fault diagnosis module (15) controls a first solid state relay (SSR 1) in the first machine side converter (6) and a fifth solid state relay (SSR 5) in the second machine side converter (7) to be switched on, and at the moment, the topological structure of the common bus double-level converter is changed; the synthesized space voltage vector generated by the changed topological structure of the common bus double-level converter can enable the system to operate in a fault-tolerant mode under a direct power control method, and a corresponding switch voltage vector selection table is shown in a table 3:
TABLE 3 switching voltage vector selection Table after failure of both a1 phase and b2 phase
The invention has the beneficial effects that:
aiming at open-circuit and short-circuit faults of a power switch device of a machine-side converter in an open-winding brushless doubly-fed wind generator system, in order to facilitate fault diagnosis and subsequent fault-tolerant control, a topological structure of a common bus double-level converter is improved, and a fault-tolerant control method adopted after different faults occur is provided based on a direct power control method. And a switching voltage vector selection table is re-established according to error signals of active power and reactive power of the power winding, a sector where a control winding flux linkage is located and fault information, and the active power and the reactive power of the open-winding brushless doubly-fed generator are independently controlled by selecting a proper space voltage vector, so that fault-tolerant operation of the system after a power switch device of the machine-side converter fails is realized.
Drawings
FIG. 1 is a topological structure diagram of an improved common bus dual-level converter of the present invention;
FIG. 2 is a schematic diagram of the direct power control principle of the open-winding brushless doubly-fed generator according to the present invention;
fig. 3 is a three-phase four-switch structure space voltage vector diagram of the machine side converter 6 of the present invention;
fig. 4 is a composite diagram of the space voltage vectors generated by the dual two-level converter after a 1-phase fault of the machine side converter 6 according to the present invention;
fig. 5 is a composite diagram of space voltage vectors generated by the dual-level converter after a1 phase of the machine-side converter 6 and a2 phase of the machine-side converter 7 both fail according to the present invention;
fig. 6 is a composite diagram of space voltage vectors generated by the dual-level converter after a1 phase of the machine-side converter 6 and a b2 phase of the machine-side converter 7 both fail;
description of reference numerals:
1. an open-winding brushless doubly-fed generator; 2. a power winding; 3. a control winding; 4. a rotor; 5. a power grid; 6. a first machine-side converter; 7. a second machine-side converter; 8. a Solid State Relay (SSR); 9. rapidly fusing the wire; 10. a coordinate transformation module; 11. an instantaneous power calculation module; 12. a control winding flux linkage sector judging module; 13. an active power hysteresis comparator; 14. a reactive power hysteresis comparator; 15. a fault diagnosis module; 16. and a switching voltage vector selection module.
Detailed Description
The invention provides an open-winding brushless doubly-fed wind generator system, which is shown in figure 1 and is characterized in that: the system comprises an open-winding brushless double-fed generator 1, wherein the open-winding brushless double-fed generator 1 is provided with two sets of three-phase symmetrical stator windings with different pole numbers, namely a power winding 2 and a control winding 3. The power winding 2 is connected with a power grid 5 and used for generating electric energy, and the number of pole pairs is p p (ii) a The control winding 3 is an open winding structure, namely 6 terminals of the control winding 3 are all led out, two ends of the control winding are respectively connected with machine side converters 6 and 7 and used for slip frequency excitation, and the number of pole pairs is p c . The coupling between the power winding 2 and the control winding 3 is realized by a rotor 4, the number of pole pairs of the rotor 4 is p r ＝p p +p c 。
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system is characterized by comprising the following steps: in order to facilitate fault diagnosis and enable the system to operate in fault-tolerant mode after the power switch device of the machine-side converter is in open circuit or short circuit fault, the topological structure of a common double-level converter is improved, and the active power and the reactive power of a power winding are independently controlled by selecting a proper space voltage vector based on a direct power control method, so that the system can operate in fault-tolerant mode after the power switch device is in fault.
Fig. 1 is an improved common-bus dual two-level converter topology structure of the present invention, in which some relays 8 and fast fuses 9 capable of conducting in two directions are added in the traditional dual two-level converter topology structure, and when a power switch device has a short-circuit fault, the fast fuses 9 can be disconnected rapidly, so that the short-circuit fault is converted into an open-circuit fault, and therefore, the fault diagnosis module 15 only needs to detect the open-circuit fault, thereby simplifying the design of the fault diagnosis module 15. The fault information obtained by the fault diagnosis module 15 is used for switching on the bidirectional conductive relay 8 connected with the fault phase bridge arm, isolating the fault phase power switch device and reconstructing a topology structure of the double-two-level converter, thereby laying a foundation for subsequent fault-tolerant control.
FIG. 2 is a schematic diagram of the direct power control principle of the open-winding brushless doubly-fed generator of the present invention, wherein P is ref And Q ref Respectively representing the given values of the active and reactive power of the power winding 2, P p And Q p Respectively representing the actual values of active and reactive power, deltaP, of the power winding 2 p And Δ Q p The method is characterized in that errors of actual values of active power and reactive power of a power winding 2 and a given value are respectively expressed, u represents voltage, i represents current, a corner mark p represents active power 2, a corner mark c represents a control winding 3, a corner mark abc represents a three-phase static coordinate system, and a corner mark alpha beta represents a two-phase static coordinate system.
The control concept of the direct power control method is derived from direct torque control and incorporates instantaneous power theory. The method comprises the steps of re-establishing a switching voltage vector selection table according to error signals of active power and reactive power of a power winding 2 and information of a sector where a flux linkage of a control winding 3 is located, and directly and independently controlling the active power and the reactive power of the open-winding brushless doubly-fed generator by properly selecting a switching voltage vector.
Collecting voltage and current signals u of a power winding 2 p And i p And controlVoltage and current signal u for the control winding 3 c And i c Obtaining voltage and current signals u of the power winding 2 under the two-phase static coordinate system through the coordinate transformation module 10 pαβ And i pαβ And control winding 3 voltage and current signals u cαβ And i cαβ ，u pαβ And i pαβ The instantaneous active power P output by the power winding 2 is obtained through the instantaneous power calculation module 11 p And reactive power Q p ，u cαβ And i cαβ The flux angle theta and the given values P of the active power and the reactive power of the power winding 2 are obtained through the control winding flux linkage sector judgment module 12 ref And Q ref Actual values of active and reactive power P to the power winding 2 p And Q p The error value delta P between the actual value of the active power and the actual value of the reactive power of the power winding 2 and the given value is obtained by comparing the active power hysteresis comparator 13 with the reactive power hysteresis comparator 14 p And Δ Q p Then, the control signal u of the machine-side converters 6 and 7 is obtained through the switching voltage vector selection module 16 by combining the fault information and the magnetic chain angle theta of the fault diagnosis module 15 abc1 And u abc2 And further drives the open-winding brushless doubly-fed generator 1 to realize fault-tolerant operation based on direct power control.
Fig. 3 is a three-phase four-switch structure space voltage vector diagram of the first machine-side converter 6 according to the present invention. If the a 1-phase arm of the first machine-side converter 6 has a fault, the first solid-state relay SSR1 is turned on according to the diagnosed fault signal, one side of the phase control winding is connected to the midpoint of the dc bus, and the machine-side converter 6 is in a three-phase four-switch structure. The space voltage vector shown in fig. 3 (a) can be formed by controlling the remaining power switches of the converter. If the b1 phase or c1 phase of the machine-side converter 6 fails, the space voltage vector shown in fig. 3 (b) or 3 (c) can be formed by controlling the remaining power switches, respectively.
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system has the basic idea that after an a 1-phase bridge arm of a machine-side converter 6 fails, the fault-tolerant control method comprises the following steps: after the a 1-phase bridge arm of the machine-side converter 6 fails, the fault diagnosis module 15The first solid-state relay SSR1 in the control-machine-side converter 6 is turned on, when the resultant space voltage vector of the first machine-side converter 6 and the second machine-side converter 7 is as shown in fig. 4. The first machine-side converter 6 and the second machine-side converter 7 share 32 different switching states at this time, and 14 space voltage vectors distributed at different positions can be generated, wherein no zero vector exists. U shape a-b Representing the voltage vector U generated by the first machine-side converter 6 a With the voltage vector U generated by the second machine-side converter 7 b The resultant space voltage vector. The voltage vector for fault tolerant operation is the voltage vector U in FIG. 4 (a) 2-1 、U 3-6 、U 2-6 、U 2-5 、U 1-5 、U 2-4 、U 1-4 、U 1-3 、U 4-4 、U 4-3 、U 4-2 、U 3-2 、U 4-1 、U 3-1 And voltage vector U in FIG. 4 (b) 2-1 、U 3-6 、U 1-6 、U 2-0 、U 2-7 、U 3-5 、U 1-5 、U 2-4 、U 1-4 、U 1-3 、U 4-4 、U 1-2 、U 3-3 、U 4-0 、U 4-7 、U 3-2 、U 4-1 、U 3-1 The selection principle is based on a direct power control method, namely when the positions of flux linkages of the control windings are different, the active power or the reactive power of the power winding is independently controlled by selecting a proper voltage vector of the control winding. At this time, there are two different voltage vector selection schemes, as shown in fig. 4 (a) and 4 (b), respectively, which divide the whole plane into 10 sectors and 8 sectors according to the selected voltage vector, respectively, so as to achieve the purpose of accurate control, and the corresponding switching voltage vector selection tables are shown in table 1 (a) and table 1 (b), respectively.
TABLE 1 (a) switching Voltage vector selection Table after a 1-phase Fault
TABLE 1 (b) switching Voltage vector selection Table after a 1-phase Fault
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system has the following basic idea that when an a 1-phase bridge arm of a first machine-side converter 6 and an a 2-phase bridge arm of a second machine-side converter 7 both fail, the fault-tolerant control method comprises the following steps: when both the a 1-phase arm of the first machine-side converter 6 and the a 2-phase arm of the second machine-side converter 7 are in fault, the fault diagnosis module 15 controls the first solid-state relay SSR1 in the first machine-side converter 6 and the fourth solid-state relay SSR4 in the machine-side converter 7 to be turned on, at this time, the synthesized space voltage vectors generated by the machine-side converter 6 and the machine-side converter 7 are as shown in fig. 5, and include 12 effective voltage vectors and 4 zero vectors, and the voltage vector used for fault-tolerant control is the voltage vector U in fig. 5 2-1 、U 3-4 、U 1-4 、U 2-3 、U 1-3 、U 1-2 、U 4-3 、U 3-2 、U 4-1 、U 3-1 . The 6 effective voltage vectors selected have the same length, and in order to prevent large power fluctuation, U 2-4 ,U 4-2 And the corresponding switching voltage vector selection table is shown in table 2, and is not applied to the fault-tolerant operation strategy based on direct power control.
Table 2 switching voltage vector selection table after failure of both a 1-phase arm and a 2-phase arm
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system has the basic idea that when the a1 phase of the first machine-side converter 6 and the b2 phase of the second machine-side converter 7 both fail, the fault-tolerant control method comprises the following steps: when both the a1 phase of the first machine-side converter 6 and the b2 phase of the second machine-side converter 7 fail, the failure diagnosis is performedThe disconnection module 15 controls the first solid state relay SSR1 in the first machine-side converter 6 and the fifth solid state relay SSR5 in the second machine-side converter 7 to be turned on, and at this time, the resultant space voltage vectors generated by the first machine-side converter 6 and the second machine-side converter 7 are as shown in fig. 6, and include 16 different effective voltage vectors and zero-free vectors, where the voltage vector used for fault-tolerant control is the voltage vector U in fig. 6 2-3 、U 2-2 、U 1-2 、U 1-1 、U 4-2 、U 4-1 、U 4-4 、U 3-4 、U 2-4 、U 3-3 The corresponding switching voltage vector selection table is shown in table 3:
TABLE 3 switching voltage vector selection Table after failure of both a1 phase and b2 phase
Claims (5)
1. The common bus open winding brushless doubly-fed wind generator system fault-tolerant control method is characterized by comprising the following steps of: a bidirectional breakover relay (8) and a quick fuse (9) are added into a topological structure of a common bus double-level converter, and the active power and the reactive power of a power winding are independently controlled by selecting a proper space voltage vector based on a direct power control method, so that the system can run in a fault-tolerant mode after a power switch device fails; the fault-tolerant control method comprises the steps of re-establishing a switching voltage vector selection table according to error signals of active power and reactive power of a power winding (2), information of a sector where a flux linkage of a control winding (3) is located and fault information of a fault diagnosis module (15), opening a corresponding bidirectional conductive relay (8) according to the fault information of the fault diagnosis module (15) to reconstruct a topological structure of a converter, and independently controlling the active power and the reactive power of the power winding (2) of the open-winding brushless double-fed generator by selecting a proper space voltage vector so as to realize fault-tolerant operation of the system after a power switch device is in fault;
when the power switch device has a short-circuit fault, the quick fuse (9) is rapidly disconnected, so that the short-circuit fault is converted into an open-circuit fault, and the fault diagnosis module (15) only detects the open-circuit fault; the fault information obtained by the fault diagnosis module (15) is used for switching on a bidirectional conductive relay (8) connected with a fault phase bridge arm, and a topological structure of the double-two-level converter is reconstructed while a fault phase power switch device is isolated;
collecting a voltage signal u of a power winding (2) p And a current signal i p And a voltage signal u for controlling the winding (3) c And a current signal i c Obtaining a voltage signal u of the power winding (2) under the two-phase static coordinate system through a coordinate transformation module (10) pαβ And a current signal i pαβ And a control winding (3) voltage signal u cαβ And a current signal i cαβ Voltage signal u of the power winding (2) pαβ And a current signal i pαβ Instantaneous active power P output by the power winding (2) is obtained through the instantaneous power calculation module (11) p And reactive power Q p Controlling the voltage signal u of the winding (3) cαβ And a current signal i cαβ The flux angle theta is obtained through a control winding flux linkage sector judgment module (12), and the active power given value P of the power winding (2) ref Actual value P of active power of power winding (2) p The error value delta P between the actual active power value and the given value of the power winding (2) is obtained by comparing the active power hysteresis comparator (13) p Given value of reactive power Q of power winding (2) ref Actual value Q of reactive power with the power winding (2) p The error value delta Q between the actual reactive power value and the given value of the power winding (2) is obtained by comparing the actual reactive power value with a reactive power hysteresis comparator (14) p After the power switch device has a fault, a bidirectional breakover relay (8) connected with a fault phase bridge arm is switched on by utilizing fault information of a fault diagnosis module (15) to reconstruct a topological structure of the converter, and then the fault information of the fault diagnosis module (15), an actual value of active power and an error value delta P of a given value are used for reconstructing a topological structure of the converter p Error value delta Q of actual value and given value of reactive power p And combining the magnetic chain angle theta to formulate a corresponding switching voltage vector selection table, and obtaining a control signal u of the machine side converter (6) through a switching voltage vector selection module (16) abc1 Control signal u of machine side converter (7) abc2 Further driving the open-winding brushless doubly-fed generator (1) to realize fault-tolerant control;
when an al-phase bridge arm of the machine-side converter (6) fails, the fault diagnosis module (15) controls a first solid-state relay SSR1 in the first machine-side converter (6) to be switched on, and at the moment, the topological structure of the common-bus double-level converter is changed; the system can operate in fault tolerance under a direct power control method by utilizing a synthesized space voltage vector generated by the changed topological structure of the common bus double-level converter;
when an al-phase bridge arm of the machine side converter (6) and an a 2-phase bridge arm of the machine side converter (7) both have faults, the fault diagnosis module (15) controls a first solid state relay SSR1 in the first machine side converter (6) and a fourth solid state relay SSR4 in the second machine side converter (7) to be switched on, and at the moment, the topological structure of the common-bus double-level converter is changed; the system is subjected to fault-tolerant operation under a direct power control method by utilizing a synthesized space voltage vector generated by the changed topological structure of the common bus double-level converter;
when the phase al of the machine side converter (6) and the phase b2 of the machine side converter (7) both have faults, the fault diagnosis module (15) controls a first solid state relay SSR1 in the first machine side converter (6) and a fifth solid state relay SSR5 in the second machine side converter (7) to be switched on, and at the moment, the topological structure of the common-bus double-level converter is changed; and the system is subjected to fault-tolerant operation under a direct power control method by utilizing a synthesized space voltage vector generated by the changed topological structure of the common bus double-level converter.
2. The fault-tolerant control method of claim 1, characterized in that: after the first solid state relay SSR1 is switched on, the first machine-side converter (6) and the second machine-side converter (7) share 32 different switching states, 14 space voltage vectors distributed at different positions are generated, and no zero vector exists; u shape a-b Indicating that generated by a first machine-side converter (6)Voltage vector U a Voltage vector U generated by machine side converter (7) b The resultant space voltage vector; the selection principle of the voltage vector for fault-tolerant operation is based on a direct power control method, namely when the positions of control winding magnetic chains are different, the active power or reactive power of a power winding is independently controlled by selecting a proper control winding voltage vector; there are two different voltage vector selection schemes, which divide the whole plane into 10 sectors and 8 sectors according to the selected voltage vector, so as to achieve the purpose of accurate control, and the corresponding switch voltage vector selection tables are respectively as follows:
TABLE 1 (a) switching Voltage vector selection Table after a 1-phase Fault
TABLE 1 (b) switching Voltage vector selection Table after a 1-phase Fault
3. The fault-tolerant control method of claim 1, characterized in that: when both the al-phase arm of the machine-side converter (6) and the a 2-phase arm of the machine-side converter (7) fail, the corresponding switching voltage vector selection table is shown in table 2:
table 2 switching voltage vector selection table after failure of both a 1-phase bridge arm and a 2-phase bridge arm
4. The fault-tolerant control method of claim 1, characterized in that: when both the phase al of the machine side converter (6) and the phase b2 of the machine side converter (7) fail, the corresponding switching voltage vector selection table is shown in table 3:
TABLE 3 switching Voltage vector selection Table after failure of both a1 phase and b2 phase
5. The system special for implementing the fault-tolerant control method of the common-bus open-winding brushless doubly-fed wind generator system of claim 1 is characterized in that: the system comprises an open-winding brushless double-fed generator (1), wherein the open-winding brushless double-fed generator (1) is provided with two sets of three-phase symmetrical stator windings with different pole numbers, namely a power winding (2) and a control winding (3), the power winding (2) is connected with a power grid (5), and the pole number of the power winding (2) is p p The control winding (3) is of an open winding structure, namely 6 terminals of the control winding (3) are respectively led out from two ends, the two ends are respectively connected with the first machine side converter (6) and the second machine side converter (7), and the number of pole pairs of the control winding (3) is p c The coupling relation between the power winding (2) and the control winding (3) is realized by the rotor (4), and the number of pole pairs of the rotor (4) is p r ＝p p +p c 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810503073.0A CN108809173B (en) | 2018-05-23 | 2018-05-23 | Common-bus open-winding brushless doubly-fed wind generator system fault-tolerant control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810503073.0A CN108809173B (en) | 2018-05-23 | 2018-05-23 | Common-bus open-winding brushless doubly-fed wind generator system fault-tolerant control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108809173A CN108809173A (en) | 2018-11-13 |
| CN108809173B true CN108809173B (en) | 2022-11-25 |
Family
ID=64091586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810503073.0A Active CN108809173B (en) | 2018-05-23 | 2018-05-23 | Common-bus open-winding brushless doubly-fed wind generator system fault-tolerant control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108809173B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109495049B (en) * | 2018-11-29 | 2021-10-08 | 江苏大学 | Unit power factor direct torque control method for permanent magnet vernier motor |
| CN110086402A (en) * | 2019-04-15 | 2019-08-02 | 沈阳工业大学 | Based on the inexpensive permanent-magnet synchronous controller for opening winding |
| CN113517717B (en) * | 2021-06-23 | 2022-01-25 | 天津滨电电力工程有限公司 | Control method for grid-connected operation of open-winding double-fed wind driven generator of micro-grid |
| CN116613753B (en) * | 2023-07-20 | 2023-09-15 | 三峡科技有限责任公司 | Fault-tolerant operation control method for electric energy meter of wind turbine generator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983590A (en) * | 2012-11-28 | 2013-03-20 | 沈阳工业大学 | System and method for controlling direct power of open-winding brushless double-fed wind driven generator |
| CN104362923A (en) * | 2014-11-05 | 2015-02-18 | 东南大学 | Decoupling SVPWM (space vector pulse width modulation) based fault tolerance control method for open-winding PMSM (permanent magnet synchronous motor) driving system |
-
2018
- 2018-05-23 CN CN201810503073.0A patent/CN108809173B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983590A (en) * | 2012-11-28 | 2013-03-20 | 沈阳工业大学 | System and method for controlling direct power of open-winding brushless double-fed wind driven generator |
| CN104362923A (en) * | 2014-11-05 | 2015-02-18 | 东南大学 | Decoupling SVPWM (space vector pulse width modulation) based fault tolerance control method for open-winding PMSM (permanent magnet synchronous motor) driving system |
Non-Patent Citations (2)
| Title |
|---|
| Dual Two-Level Converters Based on Direct Power Control for an Open-Winding Brushless Doubly-Fed Reluctance Generator;shijin 等;《IEEE Transactions on Industry Applications》;20170412;第53卷(第4期);第3898–3906页 * |
| Performance Comparison of Direct Power Control for Brushless Doubly-Fed Wind Power Generator with Different Control Winding Structure;shijin 等;《2016 IEEE Transportation Electrification Conference and Expo》;20160714;第261-266页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108809173A (en) | 2018-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108809173B (en) | Common-bus open-winding brushless doubly-fed wind generator system fault-tolerant control method | |
| CN102522945B (en) | Polyphase motor fault-tolerant control method and system based on multi-neural-network inverse model | |
| CN106470008B (en) | Double winding fault tolerant permanent magnet power drive system based on three-phase four-arm and control method | |
| CN102484448B (en) | Variable coil configuration system, apparatus and method | |
| CN206135760U (en) | Fault -tolerant power drive system of duplex winding permanent magnetism based on three -phase four -leg | |
| CN103812319B (en) | A kind of four phase brushless DC motor error tolerant power converter and control methods | |
| CN104604068A (en) | System and method for protecting electrical machines | |
| CN105743398B (en) | Current setting approach for five-phase PMSM winding open fault faults-tolerant control | |
| CN103337999B (en) | Two remaining fault tolerant permanent magnet machine direct Torque Control and method | |
| CN108023524A (en) | The open PMSM Drive System of winding and winding switchover policy | |
| CN101667805A (en) | Six-phase permanent magnet fault-tolerant motor control system | |
| CN108649843A (en) | A kind of permanent magnetism starting-generating system and its control method with open circuit fault-tolerant ability | |
| CN105048488A (en) | Flexible DC network DC short-circuit fault ride through method | |
| CN112117941A (en) | Fault-tolerant control method of open-winding permanent magnet synchronous motor based on model prediction current control | |
| CN101272125A (en) | Motor drive system with fault tolerance function | |
| CN113872482B (en) | Axial magnetic field flux switching permanent magnet motor single-phase fault-tolerant control method | |
| CN101667804A (en) | Multiphase permanent magnet fault-tolerant motor control system in half-bridge structure | |
| CN105356816A (en) | Multi-type fault tolerance system for switched reluctance motor based on relay network | |
| CN111490525A (en) | Open-phase detection and fault-tolerant control method for three-phase photovoltaic inverter | |
| CN112285607B (en) | Single-tube open-circuit fault diagnosis method of open-winding electric drive system based on predictive control | |
| CN204392076U (en) | A kind of phase redundancy type three-phase inverter fault tolerable circuit | |
| CN212627675U (en) | Composite fault-tolerant inverter suitable for three-phase motor | |
| CN108667365B (en) | Fault-tolerant control method for open-winding brushless doubly-fed generator system of double three-level converter | |
| Jiang et al. | Analysis of highly reliable electric drive system based on dual-winding fault-tolerant permanent magnet motor | |
| CN108736772B (en) | Open-winding brushless doubly-fed generator system fault-tolerant control based on direct power control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |